Elevator



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s. T. LEWIS.

ELEVATOR.

No. 568,576.. I Patentedfiept. 29, 1896.

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s; T. LEWIS.

amvuoa. No. 568,576. Patented Sept. 29, 1896.

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Nrrn STATES SAMUEL T. LEWIS, OF PHILADELPHIA, PENNSYLVANIA.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 568,576, datedSeptember 29, 1896.

Application filed April 14, 1896.

To all 1072 0771, it may concern:

Be it known that I, SAMUEL T. LEWIs, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inElevators, of which the following is a specification.

My invention relates to a new and useful improvement in safetyattachments for elevators, and has for its object to provide a device ofthis character which when applied to an ordinary elevator-car willpreclude the possibility of said elevator-car dropping should thelifting-cable be broken.

With these ends in view my invention consists in the details ofconstruction and combination of elements hereinafter set forth,and thenspecifically designated by the claims.

In order that those skilled in the art to which this inventionappertains may understand how to make and use the same, I will describeits construction and operation in detail, refering by number to theaccompanying drawings, forming a part of this specification, and inWhich- Figure 1 is a sectional elevation of a portion of an elevatorhaving my improvement applied thereto; Fig. 2, a view taken at rightangles to Fig. 1; Fig. 3, a perspective of the upper portion of anelevator, showing the proper relative position of the gears and severaloperating parts.

Rack-bars 1 are located within the shaft in which the elevator-car 2 isadapted to travel, and said elevator ca-r is provided with suitablebearings in which is journaled the cross-shaft 3, having secured uponits ends the pinions 4, adapted to mesh with said rack-bars, and alsosecured upon the shaft is a gear-wl1eel5, which meshes with the pinion6, the latter being secured upon the short shaft 7, journaled insuitable bearings and carrying a disk 8, whose perimeter is ascrolljarranged to produce a shoulder 9 for the purpose hereinafterexplained.

10 is a shaft journaled in the bearings 11, and upon this shaft issecured the levers 12 and 13, the former serving as an arm to which oneend of the spring 14 is attached, the other end of said spring beingattached to a post 15. Ihe action of this spring is to draw the lever 12forward. The outer end of the lever as No. 587,537. (No man.)

13 projects through the housing 16, in which are formed suitable slotsfor the reception of said lever, and in this housing is guided adraw-bar 17, through which the lever 13 also passes. With the upper endof the draw-bar is formed an eye 18, by means of which the cable 19 isattached to said bar for the purpose of raising and lowering theelevator-car.

20 is a dog rigidly secured upon the shaft 10, and the nose of this dogextends within close proximity to the perimeter of the disk 8, so thatwhen the weight of the elevatorcar is supported by the cable thedraw-bar will be moved upward to its limit, which is determined by theend of the lever 13 striking against the upper end of the slots throughwhich it passes, and when the lever 13 is in this position the dog 20will be held out of contact with the disk 8 against the action of thespring 14, leaving said disk free to revolve during the up-and-downmovement of the elevator-car, which revolutions will be occasioned bythe pinion 4, traveling in the rack-bars, but should the draw-bar berelieved of the strain incident to the supporting of the elevator-car bythe cable on ac' count of the breakage of the latter the spring 14 willdraw the lever 12 forward, which will revolve the shaft 10 sufficientlyto bring the nose of the dog 20 into contact with the perimeter of thedisk 8, so that when the latter is caused to revolve in the direction ofthe arrow by the downward movement of the elevator-car the shoulder 9will strike against said nose and arrest the revolutions of said disk,which, on account of its being geared with the shaft 3, will prevent thelatter from revolving, and which in turn will prevent the descent of theelevator by the meshing of the pinions 4 with the rack-bars, as will bereadily understood. From this it will be seen that an elevator having myimprovement attached thereto can fall but a few inches should the cableat any time break, since the relative revolutions of the disk 8 andpinions 4 are four to one.

Having thus fully described my invention, What I olaim'as new and usefulis- 1. In a device of the character described, rack-bars, a car, a shaftjournaled thereon carrying pinions meshing with said racks, a gear-wheelsecured on the shaft, a pinion meshing with the gear and carrying adisk, a sliding draw-head and means for engaging the disk when thestrain is released from the draw-head, as and for the purpose described.

2. The herein-described combination of an elevator-car,rack-bars uponeitherside thereof, pinions meshing with said bars, a shaft upon whichsaid pinions are secured, said shaft being, journaled in suitablebearings attached to the elevator-ear, a gear-wheel secured upon saidshaft, a pinion (3 with which said gear meshes, a disk 8 secured uponthe same shaft with the last-named pinion, a shoulder formed upon theperimeter of said disk, a dog adapted to engage said shoulder, a shaftupon which said dog is secured, a spring-actuated arm also secured uponthe 1ast-nained shaft, an arm 13 carried by the same shaft, a housingsecured to the top of the elevator-ear, a draw-bar guided within saidhousing to which the lever 13 is eonneeted, a supporting-cable securedto the upper end of the draw-bar, whereby the weight of the elevator-caris caused to hold the dog out of engagement with the disk, substantiallyas and for the purposes set forth.

In testimony whereof I have hereunto affixed by signature in thepresence of two subseribin g witnesses.

SAMUEL 'i. LEWIS. Witnesses:

S. S. WILLIAMSON, MARK Bureau.

